after getting a pop-up telling me: "Manual intervention required] Package conflict between pipewire-media-session & wireplumber" i've had a simular problem when playing videos... in my browser (defining my browser: Firefox) the playback was very slow and in my players (defining my players: VLC, mplayer) i had no sound. So i searched the forum and found the post below that fixed my video playback problems: [Manual intervention required] Package conflict between pipewire-media-session & wireplumber
i followed the instructions and all video playback works okay again ... maybe it works for you too